package com.atguigu.springcloud.service;

import cn.hutool.core.util.IdUtil;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.PathVariable;

import java.util.concurrent.TimeUnit;

@Service
public class PaymentService {

    /**
     * 正常访问，肯定OK
     *
     * @param id
     * @return
     */
    public String paymentInfo_OK(Integer id) {
        return "线程池：" + Thread.currentThread().getName() + " paymentInfo_OK，id：" + id + " 正常访问！";
    }

    /************************* 服务降级 *************************/

    /**
     * 超时访问，演示降级
     *
     * @param id
     * @return
     */
    @HystrixCommand(fallbackMethod = "paymentInfo_TimeoutHandler", commandProperties = {
            @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "5000")
    })
    public String paymentInfo_Timeout(Integer id) {

//        int timeNumber = 10 / 0;
        int timeNumber = 3000;
        try {
            TimeUnit.MILLISECONDS.sleep(timeNumber);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "线程池：" + Thread.currentThread().getName() + " paymentInfo_Timeout，id：" + id + " 耗时(秒)：" + timeNumber;
    }

    /**
     * 兜底方法
     *
     * @param id
     * @return
     */
    public String paymentInfo_TimeoutHandler(Integer id) {

        return "线程池：" + Thread.currentThread().getName() + " 系统繁忙或者运行报错，请稍后再试，id：" + id + " 服务降级！";
    }

    /************************* 服务熔断 *************************/

    /**
     * 服务熔断
     *
     * @param id
     * @return
     */
    @HystrixCommand(fallbackMethod = "paymentCircuitBreaker_fallback", commandProperties = {        // 表示10秒之内，如果10次访问有60%失败，跳闸
            @HystrixProperty(name = "circuitBreaker.enabled", value = "true"),                      // 是否开启断路器
            @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold", value = "10"),         // 请求次数
            @HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds", value = "10000"),   // 时间窗口期
            @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "60"),       // 失败率达到多少后跳闸
    })
    public String paymentCircuitBreaker(@PathVariable("id") Integer id) {
        if (id < 0) {
            throw new RuntimeException("****id 不能为负数");
        }
        String serialNumber = IdUtil.simpleUUID();

        return Thread.currentThread().getName() + "\t" + "调用成功，流水号：" + serialNumber;
    }

    public String paymentCircuitBreaker_fallback(@PathVariable("id") Integer id) {
        return "id 不能为负数,请稍后再试， o(╥﹏╥)o id: " + id;
    }

}